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Buying guide

Espresso knock boxes and cleaning (2026)

Three ways to dump a puck — a compact Revolution box, a larger Grindenstein, and a Rhino through-counter chute — plus Cafiza, Dezcal, Full Circle tablets, a Cafelat brush, and GRINDZ.

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Cleaning is the unglamorous half of better espresso. Keep a knock box next to the machine, backflush with Cafiza if your machine allows it, descale with Dezcal on the schedule in your manual, and run GRINDZ through the grinder.

Quick picks

The short list.

Prima Coffee prices, checked Nov 5, 2026.

PickModelPriceBuy
Compact knock boxRevolution Basic Knock Box, 6" x 5.5" x 4"$28.70Check price on Prima
Larger knock boxBig Grindenstein Super-sized Knock Box$41.49Check price on Prima
Through-counter chuteRhino Coffee Gear Square Knock Chute$62.95Check price on Prima
Backflush detergentUrnex Cafiza Espresso Machine Cleaning Powder (20 oz)$10.99Check price on Prima
DescalerUrnex Dezcal Activated Descaling Liquid$13.99Check price on Prima
Cleaning tabletsFull Circle Espresso Machine Cleaning Tablets$19.99Check price on Prima
Group-head brushCafelat Espresso Machine Cleaning Brush$16.20Check price on Prima
Grinder cleanerUrnex GRINDZ Grinder Cleaning Tablets (430 g)$32.99Check price on Prima

Knock boxes

A compact box, a larger box, and a through-counter chute.

1

Compact knock box

Revolution Basic Knock Box, 6" x 5.5" x 4"

Revolution basic knock box
Photo: Prima Coffee

Why we picked it

A compact countertop knock box for dumping used pucks. Prima Coffee lists the Revolution Basic Knock Box at 6 by 5.5 by 4 inches and $28.70.

$28.70

Prima Coffee price, checked Nov 6, 2026

What we like

  • Small enough for a home counter
  • A dedicated place to knock out pucks instead of the trash can
  • The least expensive knock box we list

What to know

  • At this size you will empty it often if you pull many shots a day
  • It sits on the counter; it is not a through-counter chute
Size
6" x 5.5" x 4"
Prima price
$28.70

Details from Prima Coffee's Revolution Basic Knock Box page, checked Nov 5, 2026.

Check price on Prima

2

Larger knock box

Big Grindenstein Super-sized Knock Box

Big Grindenstein super-sized knock box
Photo: Prima Coffee

Why we picked it

A larger knock box if the compact Revolution box feels too small. Prima Coffee lists the Big Grindenstein at $41.49.

$41.49

Prima Coffee price, checked Nov 6, 2026

What we like

  • Super-sized, so it holds more pucks between empties
  • A upgrade in capacity from the basic box
  • Still a countertop box, with no plumbing

What to know

  • It takes more counter space than the 6-inch Revolution box
  • At $41.49 it costs more than the compact option
Style
Super-sized countertop knock box
Prima price
$41.49

Details from Prima Coffee's Big Grindenstein page, checked Nov 5, 2026.

Check price on Prima

3

Through-counter chute

Rhino Coffee Gear Square Knock Chute

Rhino Coffee Gear square knock chute
Photo: Prima Coffee

Why we picked it

A square knock chute that mounts through the counter so pucks drop into a bin below. Prima Coffee describes a straight-through path that lets you choose the bin size underneath. This is the pick if you want a built-in bar setup rather than a box that sits on top.

$62.95

Prima Coffee price, checked Nov 6, 2026

What we like

  • Through-counter design, per Prima Coffee
  • You choose the grounds bin underneath
  • The most permanent of the three knock options

What to know

  • You need to cut an opening in the counter
  • This is not a portable box you can move to a new kitchen easily
Style
Square through-counter chute
Prima price
$62.95

Details from Prima Coffee's Rhino Square Knock Chute page, checked Nov 5, 2026.

Check price on Prima

Cleaning supplies

Detergent, descaler, tablets, a brush, and grinder cleaner.

4

Backflush detergent

Urnex Cafiza Espresso Machine Cleaning Powder (20 oz)

Urnex Cafiza espresso machine cleaning powder, 20 ounce container
Photo: Prima Coffee

Why we picked it

Cafiza is the backflush detergent most home espresso owners should keep next to the machine. Prima Coffee lists the 20 oz jar at $10.99. Use it on a schedule with a blind basket if your machine can backflush.

$10.99

Prima Coffee price, checked Nov 6, 2026

What we like

  • 20 oz jar, enough for regular home cleaning
  • The standard espresso-machine detergent
  • Inexpensive enough that you should not skip cleaning

What to know

  • Follow your machine's backflush instructions
  • This is detergent for the group, not a descaler for the boiler
Size
20 oz
Role
Backflush detergent
Prima price
$10.99

Details from Prima Coffee's Urnex Cafiza page, checked Nov 5, 2026.

Check price on Prima

5

Descaler

Urnex Dezcal Activated Descaling Liquid

Urnex Dezcal activated descaling liquid
Photo: Prima Coffee

Why we picked it

Dezcal is the descaler we list for hot-water tanks and boilers. Prima Coffee says it descale tanks, boilers, faucets, and spray heads with biodegradable ingredients. Use this on the schedule your machine manual calls for, separate from Cafiza backflushing.

$13.99

Prima Coffee price, checked Nov 6, 2026

What we like

  • Made for descaling, not for backflushing
  • Listed for tanks, boilers, faucets, and spray heads
  • A bottle sized for home use at $13.99

What to know

  • Do not treat this as a substitute for Cafiza
  • Check your manual; some machines specify their own descaling routine
Role
Descaling liquid
Prima price
$13.99

Details from Prima Coffee's Urnex Dezcal page, checked Nov 5, 2026.

Check price on Prima

6

Cleaning tablets

Full Circle Espresso Machine Cleaning Tablets

Full Circle espresso machine cleaning tablets
Photo: Prima Coffee

Why we picked it

Cleaning tablets for machines that use a tablet instead of (or in addition to) powder. Prima Coffee lists Full Circle espresso machine cleaning tablets at $19.99.

$19.99

Prima Coffee price, checked Nov 6, 2026

What we like

  • Tablet form if your machine calls for tablets
  • From the same cleaning family as other Urnex products on Prima Coffee
  • A clear alternative to scooping powder

What to know

  • Check whether your machine wants powder or tablets before you buy
  • Tablets are not a descaler
Form
Cleaning tablets
Prima price
$19.99

Details from Prima Coffee's Full Circle cleaning tablets page, checked Nov 5, 2026.

Check price on Prima

7

Group-head brush

Cafelat Espresso Machine Cleaning Brush

Cafelat espresso machine cleaning brush
Photo: Prima Coffee

Why we picked it

A dedicated brush for the group head and gasket. Prima Coffee lists the Cafelat espresso machine cleaning brush at $16.20. Use it to sweep leftover grounds before they bake onto the seal.

$16.20

Prima Coffee price, checked Nov 6, 2026

What we like

  • Sized for cleaning a group head
  • A daily tool, not just a deep-clean extra
  • Pairs with Cafiza on a regular cleaning routine

What to know

  • A brush does not replace backflushing or descaling
  • Keep it away from the steam wand tip if you also use that wand for milk
Role
Group-head cleaning brush
Prima price
$16.20

Details from Prima Coffee's Cafelat cleaning brush page, checked Nov 5, 2026.

Check price on Prima

8

Grinder cleaner

Urnex GRINDZ Grinder Cleaning Tablets (430 g)

Urnex GRINDZ grinder cleaning tablets in a 430 gram jar
Photo: Prima Coffee

Why we picked it

GRINDZ tablets clean coffee oils and old grounds out of a burr grinder. Prima Coffee lists the 430 g jar at $32.99 and notes a typical pass of 25 to 80 grams, nightly in a cafe or weekly at home.

$32.99

Prima Coffee price, checked Nov 6, 2026

What we like

  • Made for grinders, not espresso machines
  • 430 g jar for repeated home use
  • Prima Coffee notes a weekly home routine

What to know

  • Follow the dose on the jar; do not run it like coffee and then drink it
  • This does not replace brushing the burrs or emptying the hopper
Size
430 g jar
Role
Grinder cleaning tablets
Prima price
$32.99

Details from Prima Coffee's Urnex GRINDZ page, checked Nov 5, 2026.

Check price on Prima

How to choose

  • Most home counters. Start with the Revolution Basic Knock Box and a jar of Cafiza.
  • You pull a lot of shots. Upgrade to the Big Grindenstein so you empty it less often.
  • You want a built-in bar. The Rhino chute needs a hole in the counter and a bin underneath.
  • Descaling vs backflushing. Cafiza (or Full Circle tablets, if your machine uses tablets) cleans the group. Dezcal descale the water path. They are not interchangeable.
  • The grinder needs its own cleaner. That is GRINDZ, not Cafiza.

Related buying guides

FAQ

How often should I backflush?

Follow your machine manual. Many home machines do well with a regular water backflush and a less frequent detergent backflush using Cafiza.

Is Dezcal the same as Cafiza?

No. Cafiza is a detergent for coffee oils in the group. Dezcal is a descaler for mineral buildup in tanks and boilers.

Where do the prices come from?

Prima Coffee prices checked Nov 5, 2026.

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